Here is the full list of all 18 Brightstone Mysteries: The Others achievements.
Completed the game
FInish all minigames without skipping a single one
Finish all Hidden Object scenes without using hints
Finish the game on Expert Mode, without skipping any minigame or usining hint at all!
Collected all rings
Tranquilized the rhino
Unlocked the safe
Escaped the pit
Made a perfect cup of coffee
Entered the factory
Assembled the board
Completed the maze
Visited/Played every attraction (without skipping!)
Unlocked flower shaped lock
Entered abandoned house
Opened the hidden door
Found the hiden note
Checked in the hotel